Hail and Farewell (a translation of ave atque vale, last words of the poem Catullus 101) is a traditional military event whereby those coming to and departing from an organization are celebrated. This may coincide with a change in command, be scheduled on an annual basis, or be prompted by any momentous organizational change. It is a time to honor those who have departed the unit and thank them for their service. At the same time it is a welcome to those who are joining and introduces them to the special history and traditions of their new organization. This celebration builds organizational camaraderie and esprit de corps. It supports a sense of continuity through change.